Improvement in steam-generators



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Leners Patent No. 100,141, dated February 22, 1ste.

IMPROVEMENT IN STEAM-G'E-NIEIIRATORS.r

The Schedule referred to in these Letters Patent and makingspart of the same.'

I, JOSEPH HARRISON, Jr., of Philadelphia', county of Philadelphia, State ot' Pennsylvania, have inventedan improvement in 'Steam-Generators, of which the following is a speciiication.

Nature and Object of the Intention.

My invention relates'to improvements fully described hereafter in the cast-iron steam-generator for which Letters4 Patent were granted to me on the 4th day of October, 1859, my present improvements having been made with a. view ot' strengthening the necks ot' the groups ot' spheres of which the boiler is composed, and ot' so jointing the spheres and arranging them in sections or slabs that the latter' are capable ot' yielding at every point where ajoint occurs when subjected to unequal expansion and contraction.

Description of the Accompanying Drawing.

Figure l represents a vertical section of a portion ofI a steam-generator with my improvements;

Figure 2,.a sectional plan on the line l2, g. l;

Figure 3, a transverse section on the line 3-4, iig. l;

Figure 4 illustrates the improved mode of arranging the spheres so as to form the section or slab ot' agenerator; and

Figure 5 is a sectional plan on the line 5 6, iig.'4.

tober4, 1859, consisted of a number ot' spherical chamv hers cast in groups and united by curved necks, the

ljoints between the groups heilig united' by bolts passingr through the said spherical chambers. In the present instance I retain the general plan of construction, but in'un'ove upon the mode of' making the groups ot' spheres and the manner ot` arranging them, so as to forni a section or slab of a steam-generator.

I n tigs. 1, 2, and 3, Aand Arepresent two spheres, united by a neck, B, and thisV group is united above and below to otherl spheres by bolts designated by dotted lines a a.. Y

Ithas been found that the groups are more apt to break at' the necks than elsewhere; hence Iintroduce a strengtheniiig-web, b, extending across the inside'of the neck, as indicated in the drawing, this web being readily formed in the mold, so as lto be cast with and form a part ot' the cast-iron group.

1t is this strengthening-web lwhich constitutes the first part of my invention.

Heretoi'ore it has been my practice in arranging the cast-iron spheres and groups of spheres, and securing them together by bolts so as to make a slab -or section for a steam-generator, to make the joints between the groups rigid and unyielding, in consequenccot which leakage sometimes occurred at the joints, owing to the unequal expansion and contraction of the slabs.

In order to remedy this, I, in my patentlot' August 4, 1868, introduced whatI termed compensating units among the rigidly-joined spheres which composed the slab; that is, units connected tothe others with balland-socket joints, so that the slab might possess the yproperty otl yielding to unequal expansion and contraction wherever these compensating units occurred in the slab. v

In the present instance, however, all the joints are made of the ball-and-socket character, and the spheres are soi arranged in forming the slab or section that the latter is capable ot' yielding at every point Where a joint occurs.

It will be seen on reference to tig. 1, that where the tubular projection of the sphere A meets that of the sphere' B, the joint is of the ball-and-socket character, the dotted line x representing the spherical continuation ot' the joint; hence one sphere can move freely to the limited extent permitted by the 'tie-bolt, independently of the other, without impairing the tightness ofthe joint. It should be understood, however, that in carrying out my invention, the double spheres should be connected together, as shown in tig. 4; that is, one tubular projection, t, 'of one double sphere, P, should be'jointed to one double sphere, M, and the other tubular projection, t', of the said double sphere l, should be jointed to another double sphere P, disconnected from the double sphere M, and this should be continued throughout the series.

rlhis arrangement, however, involves the occasional introduction of single spheres at the ends of the slabs, as for instance the single sphere N, whichv is connected to one leg ot' the double sphere M.

It, however, several slabs or sections have to be united, one or more of what appear to be single spheres in iig. 4 may be actually double spheres, providing one ofthe sphere-s forms a part of one slab and the other sphere part ot' an adjoining slab, shown in the sectional plan view, tig, 5, where portions of two slabs are connected together transversely by the doubler i sphere P.

Claims. 1. A strengthening-web, b, arranged in the neck between two spheres, substantially as set forth.

2. A slab or section composed of spheres, arranged and jointed as herein setibrth.

In testimon'y7 where'ot'l have signed my name to this spccilication in the presence of two subscribing witnesses.

f JOSEPH HARRISON, Jn.

Witnesses:

L. HORACE PAULY,

F. A. OsoRN. 

